Tempering chocolate is really easy. I recently did a chocolate course near my home and we learned how to do this. What a lot of fun it is. The reason I took the course is so that I can make more and more chocolate recipes for my website www.chocolate-recipes-galore.com
Thought it would be better to answer your question using info from a chocolate website other then my own.
Follow this link and you will learn exactly how to temper chocolate and the tools required.
Eat more chocolate and stay happy. Bye.
You must have a double boiler. Once up to boiling in bottom pot, cut down the heat. Do not let water boil over into the top pan. Water touches the chocolate it will turn.